Lenovo ThinkPad P1 Extreme User Manual page 100

4. Remove the bottom cover. See "Replacing the bottom cover" on page 88.
5. Detach the connector and remove the coin-cell battery.
6. Install the new coin-cell battery and attach the connector.
7. Reinstall the bottom cover.
8. Turn the computer over. Connect the ac power adapter and all cables to the computer.
Note: After you replace the coin-cell battery, reset the system date and time in the ThinkPad Setup program.
See "Date/Time menu" on page 58.
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P1/X1 Extreme User Guide